Content of indoleacetic acid and its metabolism in root nodules ofMelilotus alba |
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Authors: | C Datta P S Basu |
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Institution: | (1) Department of Botany, University of Burdwan, Golapbag, 713 104 Burdwan, West Bengal, India |
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Abstract: | The root nodules ofMelilotus alba, a leguminous fodder herb, contain a high amount of indoleacetic acid (IAA). The tryptophan pool present in the nodule might
serve as a source for the IAA production. Metabolism of IAA in the nodules was evidenced by the presence of IAA-metabolizing
enzymes, IAA oxidase and peroxidase. A high amount of IAA was produced by the symbiont isolated from the nodules in culture,
when supplemented with tryptophan. For IAA production, the bacteria preferred thel-isomer over thedl- ord-isomer of tryptophan. The possible role of nodular IAA production on the legume-Rhizobium symbiosis is discussed. |
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